Mario Kinsella MD FAASM 10/5/2016
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1 Mario Kinsella MD FAASM 10/5/2016 Repetitive episodes of apnea or reduced airflow Due to upper airway obstruction during sleep Patients often obese Often have hypertension or DM 1
2 Obstructive apneas, hypopneas, or respiratory effort related arousals Daytime symptoms caused by disrupted sleep, such as sleepiness, fatigue, or poor concentration Signs of disrupted sleep, such as snoring, restlessness, or snorts ~ 15% males ~ 5% females Prevalence rising due to rising rates of obesity 2
3 Risk factors Age, increases from young adulthood thro seventh decade, then plateaus More common in men, rises in women after menopause Obesity, prevalence rises as the BMI rises, both in men and women Upper airway shape Nasal congestion Smoking Sedating drugs make it worse Medical conditions increase risk Pregnancy CHF ESRD Chronic lung disease Stroke and TIA Acromegaly Hypothyroidism Polycystic ovary syndrome 3
4 Gold standard is in-lab polysomnogram Home sleep studies may be acceptable IF Patient has history consistent with moderate to severe OSA No other sleep disorder suspected, such as central sleep apnea No cardiac complications like a fib, CHF 4
5 PAP Surgery Oral appliances Hypoglossal nerve stimulation Daytime function, cognition, psychiatric Drowsy driving, auto crashes 2-3 x more likely Metabolic syndrome and DM II Non-alcoholic fatty liver disease Perioperative complications Mortality 2-3 x all cause mortality if OSA is severe Cardiovascular morbidity 5
6 2-4 x more common in men BUT women appear to be more likely to develop heart complications Strong association between OSA and hypertension, CAD, cardiac arrhythmia, and heart failure Repetitive episodes of apnea or reduced inspiratory airflow due to upper respiratory obstruction during sleep Associated with intermittent hypoxemia and hypercapnia, usually provoke an arousal Arousal associated with restoration of upper airway patency and ventilation 6
7 Resulting hemodynamic, autonomic, inflammatory, and metabolic effects of abnormal breathing may contribute to the pathogenesis of a range of cardiovascular diseases OSA associated with a significant increase in sympathetic activity during sleep Increases heart rate and blood pressure OSA is clearly a significant risk factor for cardiovascular disease Associated with increased cardiovascular morbidity and mortality 7
8 Treatment CPAP improves sleep related respiratory events, daytime sleepiness, blood pressure control, and intermediate cardiovascular endpoints No studies have equivocally shown benefits in reduction in cardiovascular endpoints Cardiovascular mortality, AMI or stroke Hypertension and OSA very common together Most studies suggest the likelihood of hypertension is higher, the more severe the OSA Severity of OSA during REM sleep is more strongly associated with hypertension 8
9 Treatment of OSA lowers blood pressure Effect is greater, the more severe the OSA Effect is not as great as BP medication Severe OSA is independent risk factor for cardiovascular events related to coronary artery disease OSA is risk factor for worse outcomes in patients with CAD Having an MI appears to worsen the severity of OSA 9
10 Treating the OSA may reduce the incidence of cardiovascular events MI, Acute coronary syndrome, stroke OSA associated with higher incidence of a fib More severe the OSA, the higher incidence of a fib Association between central sleep apnea and a fib High number of pts with a fib have OSA (30-80%) OSA risk factor for recurrent a fib after ablation or cardioversion 10
11 Treatment of OSA MAY reduce risk of recurrence after cardioversion or ablation Several studies show reduction of recurrence of a fib in patients treated with OSA Bradyarrhythmias, such as atrioventricular block, sinus pause, and asystole common in severe OSA Not known if asystole contributes to increased mortality of pts with OSA PAP will help suppress noct arrhythmias in OSA Effect on mortality unknown 11
12 In people without OSA, sleep is cardioprotective Those with OSA have increased nocturnal risk of SCD OSA severity does increase risk of SCD, but risk increase much lower than CAD, cardiomyopathy, and heart failure ~ 20% pts with OSA have pulm htn If no coexisting lung disease, degree of pul htn usually mild Risk factors for pulm htn are Comorbid lung disease Daytime hypoxemia Increasing AHI Comorbid obesity hypoventilation syndrome 12
13 Treatment may help lower pulm art syst pressure Effect on mortality not known OSA Central sleep apnea, associated with Cheyne- Stokes breathing, also called cyclic respirations Cyclic crescendo-decrescendo respiratory effort and airflow during wakefulness or sleep, without upper airway obstruction When accompanied by apneas, it is considered a type of central sleep apnea Both often coexist, therefore often use term Sleep Disordered Breathing (SDB) 13
14 OSA CSA-CSB 14
15 15
16 OSA more common than CSA with CSB, the latter may be more common in CHF ~ 50% of patients with heart failure Heart failure with SDB worsens prognosis Increased nocturnal angina Recurrent arrhythmias, like a fib or v tach, can be triggered by SDB Who to test for SDB? Remember ~ 50% of patients with ht failure have SDB, therefore screening tools likely not more helpful Nocturnal angina Recurrent arrhythmia Refractory ht failure symptoms Witnessed abnormal respiratory pattern or apneas Repetitive oxygen desaturations during sleep 16
17 ACC/AHA guidelines on diagnosis and treatment of chronic heart failure indicate clinical judgement should be used to screen for SDB in selected patients Heart failure therapy PAP Improves LVEF on average ~ 5% Nocturnal oxygen If can t tolerate PAP 17
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